Furnace grate



Nov; 3, 1925. 1,560,236

C. G. HOLMES ET AL FURNACE GRATE Filed June 18, 1921 2 Sheets-Sheet 1 FIG. 1

' INVENT0RS5 Nbv. 3,1925. 0,236.. c. G. HOLMES r AL FURNACE suns,

Filed June 18. 1921 2 sheets-shat A FIG. 3

I 4 J 4-4- I4 r I V a E INVENTORS 25 M $44M, i] m ATTORNEYi f ats-rated Nov. 3, 1925.

UNITED STATES PATENT OFFICE.

CHARLES G. HOLMES AND ARTHUR E. HOLMES. MILWAUKEE, WISCOhTSIN, AS- SIGNOB-S TO RACINE FURNACE 8: FOUNDRY 00., A CORPORATION OF W'ISCONSIN.

FURNACE GRATE.

Application filed June 18, 1821. Serial No. 478,589.

To a to/mm may concern:

Be it known that we. CHARLES G. Honrmsv and ARTHUR E. Hoiiarus, citizens of the United States, and residents of Milwaukee, in the county of lifiilwaukee and State of W'isconsin, have invented new and useful Improvements in Furnace Grates, of which the following is a description, reference be ing had to the accompany ng drawings, which are a part of this specification. I

This invention relates to improvements in furnace grates, and particularly to grates having rotary grate bars.

The invention has for an OlJJGLl to provide. a simple and durable grate and grate shaking mechanism in which the successive operations of the shaking mechanism will rotate the individual grate bars 111 one d1- rect-ion, and in which adjacent bars Wlll be rotated in opposite directions.

A further object is to provide a grate construction in which an individual grate bar may be removed and replaced without disturbing the other bars.

A still further objectis to provide a sunple and durable mechanism for converting the reciprocating movement of the shaker lever into the rotary motion of the grate bars.

The invention consists in the novel constructions, arrangements and combinations, to be hereinafter described and claimed for carrying out the above stated objects and such other objects as will appear from the following description of a certain preferred embodiniieut illustrated in the accompanying drawings wherein Fig. 1 is a plan view of the grate, a part of the casing havii'ig been broken away to show the shaking mechanism Fig. 2 a front elevatiol'i, the casing hav ing been ren'ioved to show I: h e shaking mech anism.

Fig. 3 is a vertical. section taken along the line 3-3 of Fig. 1, certain of the parts having been brokenv away; and

Fig. 4 is a detail section showing a. bar supporting hook, taken along the line st d of Fig. 3.

Like characters of reference designate like parts in the several figures of the drawings.

In the drawings, designates a furnace casing having a portion 11 projecting from the furnace proper to house the shaking mechanism 12. VJithin the fire box 13 are:

disposed a plurality of grate bars 1ft, having a number of spaced triangular flanges 15. hen the invention is employed in connection with a circular firebox, as shown,

the bars vary in leng h, as illustrated. The

remote ends of the bars are supported Withinbearing projections 16 extending from the.

other end of the bar is perforated and is supported between perforated lugs 24. by means of a. pin 25. Cotter keys 26 or other suitable means, are employed to hold the pin in place, but at the same time permitting its removal in order to lower the bar 20 for the purpose hereinafter pointed out.

Adjacent their forward ends the grate bars are provided with portions 27 rectangular in cross section adapted to lit within gears 28 having corresponding squared openings. The gears 28 are designed to mesh with adjacent gears, as illustrated. Certain of the bars are provided with shoulders 29 to properly position the gears. The center bars are provided with elongated squared portions 30for the purpose of strength, and the gears 28 fitting over these bars are provided with elongated hubs 31 fitting over these squared portions. Suitable shoulders 32 on these bars serve to align the gears. V

One of the center bars is provided with a pair of spaced discs 33, suitably secured to the hub of the gear so as to transmit rotation thereto. A plurality of pins 34 corre sponding in number to the number of faces to the members 15 are placed equi-distantly apart between the discs 33. As illustrated, three pins are employed. These pins are so positioned that when the shaking mechanism, hereinafter described, operates to rotate the bars, the rotation of each of the bars will be halted so that one of the fiat surfaces of each member is uppermost, thus forming the bed of the grate. "As illustrated these pins are in substantial longitudinal alignment with the apexes of the triangular elements.

The shaking mechanism comprises a shaking lever 35 pivoted at its lower end at 36 to the casing of the furnace, and having also pivotally connected thereto intermediate its ends, a link or connecting rod 37. The connecting rod 37 is provided with a cross head 38 adapted to slide between guides 39. Connected with the cross head 38 is a link 40 which in turn is pivoted to a swinging arm ll at 42. The swinging arm at]. is pivoted to the casing of the furnace at 3. Suitable stops at are provided to limit the oscillation of the the movement of the tating the grate bars. Pivoted to the op posite end of the arm all is a pawl 44: having a hooked end 45 adapted to hook over the individual pins 84. The end at; of the pawl is provided with an inclined surface 47 to permit it to travel over the pins when moving in the opposite direction. Movement of the shaking lever toward the left as viewed in Fig. 8, causes the pawl ll "to move to the left from the position illustrated in Fig. 2, and to rotate the bars a shaking lever in rothird of a rotation, and thus bring the suc-- ce'eding flat surfaces of the members 15 into position. Alternate grate bars rotate in the same direction. The reverse movement of the shaker lever causes the pawl to travel in the opposite direction and finally to err.

gage the succeeding pin 34. It will be noted 'that each individual grate bar always rotates in one direction. One of the stops 4A prevents the grate bars from being rotated too far beyond the proper position.

In order to remove an individual grate bar for any reason, the cotter pins 26 are removed to permit the withdrawal of the pin 25. This perm-its the lowering of the lower bearing bar 20. In order to prevent.

the grate bars from falling out of place when the bar 20 is lowered, hooks as project from the furnace casing, and extend partially around the individual grate bars to hold them in place. These hooks are designed so as to extend somewhat below the normal arm l1 and in turn position of the grate bars when in place, so as not to serve as a hearing. In other words, in normaloperation the grate bars are raised slightly out of contact with the hooks 18. The grate bar desired to be removed may be disengaged from the hook and dropped to the bottom of the furnace. The bar may be withdrawn from its bearings 16 by pulling it forward. A new grate bar may be inserted in place without disturbing the arrangement of the other bars, it being merely necessary to mesh the gear on the new bar properly with the adjacent gear, so that the surface of the grate will always be flat.

It will be observed that numerous changes may be made in the construction of a furnace embodying the improved grate without departure from the spirit of the invention.

I claim:

1. In a grate construction, the combination with a. housing of a plurality of inter-- connecting grate bars pivotally mounted therein; a disc provided with a plurality of arcuately spaced pins, carried by one of said bars; a pawl reciproc'able trans versely of the axis of said disc, adapted to engage said pins to arcuately move said bars; an operating lever movable in a plane parallel to the axes of said bars; and operating connections between said lever and pawl.

2. In a grate construction, the combination with a housing of a plurality of interconnected grate bars pivotally mounted therein, alternate bars being simultaneously movable in opposite directions; a disc provided with a plurality of arcuately spaced pins, carried by one of said bars; a pawl reciproca ble transversely of the rota-tivc axis of said disc, adapted to engage said pins to arcuately move said bars; an operating lever pivotally carried by said housing for movement in a plane parallel to the axes of said bars; a swinging arm, one endof which is pivotally connected to said pawl; and links connecting said arm and levcrL In testimony whereof, we aliix our natures.

CHARLES s. noL ns. ARTHUR E. HOLMES. 

